Prepare for 7.0.0-beta02 release

Update version to release 7.0.0-beta01

Prepare release of 6.3.1

Prepare for 6.3.0 release (#1114)

Add a JitPack config to run on JDK11

AppIntro 6.1.0

This is a new minor release of AppIntro. This library comes with several new features and several bugfixes.

**Summary of Changes**

* Target SDK is now 30.
* Text visualization has been improved with Autosizing TextViews and URL autolinking.
* AppIntro now offers better support for tablets (`sw600dp`).
* Slide indicator has been improved with better color blending and it won't be shown if you have only one slide.
* The AppIntro sample app has been completely rewritten with more examples (for Java, SlidePolicy and more).
* 14 translations have been added or improved.

The full changelog is available in the [CHANGELOG file](/CHANGELOG.md)

To update make sure you:

1. **Add the JitPack repository to your build file**

```
repositories {
    maven { url "jitpack.io" }
}
```

2. **Bump the dependency**

```
dependencies {
    implementation 'com.github.AppIntro:AppIntro:6.1.0'
}
```

AppIntro 6.0.0

This is a new major release of AppIntro. Please note that this release contains multiple new features (see below), several bugfixes, as well as multiple breaking changes.
To get a deeper overview of the breaking changes, please read the [migration document](/docs/migrating-from-5.0.md).

* The library is now 100% in Kotlin! 🎉.
* Target SDK is now 29.
* The UI was completely revamped and refactored.
* You can now request permissions on AppIntro without having to lock the slide.
* The library has now 14 more translations.

The full changelog is available in the [CHANGELOG file](/CHANGELOG.md)

This release contains several breaking change.
Please read them all in the [migration document](/docs/migrating-from-5.0.md)

1. **Add the JitPack repository to your build file**

```
repositories {
    maven { url "https://jitpack.io" }
}
```

2. **Add the dependency**

```
dependencies {
    implementation 'com.github.AppIntro:AppIntro:6.0.0'
}
```

Alpha3 release of AppIntro 6.x

Please note that this versions is considered unstable and contains
several breaking changes.

Release notes will be published with the upcoming release.

Alpha2 release of AppIntro 6.x

Please note that this versions is considered unstable and contains
several breaking changes.

Release notes will be published with the upcoming release.

Alpha1 release of AppIntro 6.x

Please note that this versions is considered unstable and contains
several breaking changes.

Release notes will be published with the upcoming release.